7692번 - Election

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1 초

128 MB

1

1

1

100.000%

문제

Given the voting preferences of a population of M people, you are to determine the winner of an election among N candidates, numbered 1, . . . , N. For this problem, the M people are partitioned into G “groups” where all members within a group have the same voting preferences. The candidate preferences for a group are specified by listing candidates from most preferred to least preferred. Election results are determined by an instant-runoff voting procedure.

In this method, the first choices of the M people in the population are counted and the least popular candidate is eliminated. In the event of a tie, the highest-numbered candidate is eliminated. Then, the eliminated candidate is removed from the preference list of all M individuals in the population, and again the least popular candidate is eliminated. This process repeats until only a single candidate is left.

입력

The input test file will contain multiple test cases. Each input test case begins with a single line containing the integers G and N where 2 ≤ N ≤ 5 and 1 ≤ G ≤ 20. The next G lines are of the format “Mi ai1 ai2 . . . aiN ” where 1 ≤ Mi ≤ 20 and ai1, . . . , aiN is a permutation of the integers 1, . . . , N. Mi is the number of individuals in the ith group, and ai1, . . . , aiN is the ordering of the N candidates from most preferred to least preferred for the ith group. The end-of-file is marked by a test case with G = N = 0 and should not be processed.

출력

For each input case, the program should print the winner of the election on a single line.